President Donald Trump’s move to slap tariffs on imported solar panels and washing machines is meant to revive domestic industries. But in the affected sectors, there is little agreement on whether it will actually jump-start U.S. manufacturing and jobs.

For decades, burning coal was mainly how power companies generated the electricity to cool homes, run factories, and brighten streets. But coal has faded, and natural gas last year passed it as the leading source of electricity in the U.S.